... 1730 ° C, the melt cooled into a quartz glass, crystal crystal, with a thorough over ultraviolet light and piezoelectric.Two. ... block. Gravel for road filled with stone and railway ballast. Sand mixed with asphalt paving, quartz calibration materials can be made ... , pure quartzite with optical and ultraviolet radiation can produce a variety of optical instruments and medical quartz lamp, and ...